"Application of Density Knowledge" Quality and Density PPT Courseware

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"Application of Density Knowledge" Quality and Density PPT Courseware

Density (expressed as ρ) (a property of matter)

1. Definition: The mass per unit volume of a certain substance is called the density of the substance.

2. Calculation formula:

Density = mass/volume

ρ= ｍ/v

3. Units and conversions

kg/m³, g/cm³

1g/cm³＝1000kg/m³

The density of water is:

ρwater=1.0×10³kg/ｍ³

Physical meaning: The mass of water per cubic meter is 1.0×10³kg

think

The following are the main steps that Xiao Ming takes to measure the density of an ore using a balance and a measuring cylinder. Can you please help her read her steps? If this is done, is the measured density of the ore too high or too low?

A. Pour some water into the measuring cylinder and record the volume V1 of the water.

B. Hang the ore with a thin wire and slowly immerse it into the measuring cylinder, and measure the total volume V2 of the ore and water.

C. Use a balance to measure the mass m of the ore

D. Obtain the data from each step and bring it into the density calculation formula.

ρ=m/V2-V1

Analysis: Because the ore is stained with water when taken out of the water, and then its mass is too large when weighed, the calculated density is also too large.

What equipment do you need to measure the density of wax? Write down your experimental steps following the first two examples?

① Use a balance to measure the mass of the wax block m wax

②Inject an appropriate amount of clean water into the graduated cylinder, and measure the volume of water as vwater

③Use a fine needle to press the wax into the water so that it is submerged in the water. Measure the total volume of the wax block and water to be vtotal. Then the volume of the wax block v is obtained. Wax = vtotal - vwater.

④ Calculate the density of the wax block

Improve ability

1. How to measure the mass of a bottle of air? (given by density)

Equipment: scale, water, empty bottle

2. How to measure the density of milk?

Equipment: scale, water, beaker, milk

3. How to measure the volume of a metal block?

Equipment: balance, water, beaker, string, metal block

Three approaches:

Comparative mass method: Assuming that the aluminum ball is solid, the calculated mass of the aluminum ball is 1350g. Because 1350g>540g, it is determined that the aluminum ball is hollow.

Comparative volume method: The calculated volume of a solid aluminum ball with a mass of 540g should be 200cm³. Because 200cm³<500cm³, the aluminum ball is determined to be hollow.

Comparative density method: The average density of the ball can be found to be 1.08g/cm³ using the mass to volume ratio. Because 1.08g/cm3＜2.7g/cm³, it is determined that the aluminum ball is hollow.

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"Application of Density Knowledge" Quality and Density PPT Courseware 3:

"Application of Density Knowledge" Mass and Density PPT Courseware 3 [Experience] Identification of Substances Activity 1: Observe two glasses of pure water and salt water with the same volume. Activity 2: Identify whether a gold necklace is made of pure gold. (1) In activity 1, to identify which cup is salt water, your method is __..

"Application of Density Knowledge" Quality and Density PPT Courseware 2:

"Application of Density Knowledge" Quality and Density PPT Courseware 2 1. Proportion Questions Example 1 The density ratio of two substances A and B is 3:2, and the mass ratio is 2:1. Find the ratio of their volumes. Analysis This is a question about finding proportions. First, the volume is obtained by deforming the density formula...

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Update Time: 2024-11-22

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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